I made a red arrow pointing to the hole for the 6K6(V16 on your sams). V14 and V15 are also right there along that inside angled edge of the chassis. Sams pictorials even shows where output transformer and all the missing components will go. You will not be undoing hardly anything. You'll simply be taking the existing audio output wire and connecting it to some added circuitry. It could not be any easier if it were a Heathkit. If you can recap an entire TV, surely adding a few components to a pre-punched chassis will be a piece of cake?